Can you describe what a panic attack is like?

Panic attack: Sudden intense anxiety or apprehension accompanied by sense of impending doom and other hyperarousal symptoms, either due to medical causes or part of panic disorder.

Panic attack: Panic attacks can develop rapidly ; include: marked anxiety; rapid, pounding heart beat; chest tightness or pain; shortness of breath with hyperventilation; hot or cold flashes; a sense of butterflies in the stomach, nausea or even vomiting; tingling of mouth or extremities; increased sweating; feeling faint or lightheaded; headache or shaking. There may be difficulty swallowing or tight throat;.